Device robot refresh token integrity validation.

chrome/browser/chromeos/settings/device_oauth2_token_service.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/chromeos/settings/device_oauth2_token_service.h"
 
+#include <string>
+#include <vector>
+
 #include "base/prefs/pref_registry_simple.h"
 #include "base/prefs/pref_service.h"
+#include "base/values.h"
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/chromeos/policy/device_cloud_policy_manager_chromeos.h"
+#include "chrome/browser/policy/browser_policy_connector.h"
+#include "chrome/browser/policy/proto/cloud/device_management_backend.pb.h"
 #include "chrome/common/pref_names.h"
 #include "chromeos/cryptohome/cryptohome_library.h"
 #include "content/public/browser/browser_thread.h"
+#include "google_apis/gaia/gaia_urls.h"
+#include "google_apis/gaia/google_service_auth_error.h"
 
 namespace chromeos {
 
+// A wrapper for the consumer passed to StartRequest, which doesn't call
+// through to the target Consumer unless the refresh token validation is
+// complete.
+class DeviceOAuth2TokenService::ValidatingConsumer
+    : public OAuth2TokenService::Consumer,
+      public gaia::GaiaOAuthClient::Delegate {
+ public:
+  explicit ValidatingConsumer(DeviceOAuth2TokenService* token_service,
+                              Consumer* consumer);
+  virtual ~ValidatingConsumer();
+
+  void StartValidation();
+
+  // OAuth2TokenService::Consumer
+  virtual void OnGetTokenSuccess(
+      const Request* request,
+      const std::string& access_token,
+      const base::Time& expiration_time) OVERRIDE;
+  virtual void OnGetTokenFailure(
+      const Request* request,
+      const GoogleServiceAuthError& error) OVERRIDE;
+
+  // gaia::GaiaOAuthClient::Delegate implementation.
+  virtual void OnRefreshTokenResponse(const std::string& access_token,
+                                      int expires_in_seconds) OVERRIDE;
+  virtual void OnGetTokenInfoResponse(scoped_ptr<DictionaryValue> token_info)
+      OVERRIDE;
+  virtual void OnOAuthError() OVERRIDE;
+  virtual void OnNetworkError(int response_code) OVERRIDE;
+
+ private:
+  void RefreshTokenIsValid(bool is_valid);
+  void InformConsumer();
+
+  DeviceOAuth2TokenService* token_service_;
+  Consumer* consumer_;
+  scoped_ptr<gaia::GaiaOAuthClient> gaia_oauth_client_;
+
+  // We don't know which will complete first: the validation or the token
+  // minting.  So, we need to cache the results so the final callback can
+  // take action.
+
+  // RefreshTokenValidationConsumer results
+  bool token_validation_done_;
+  bool token_is_valid_;
+
+  // OAuth2TokenService::Consumer results
+  const Request* request_;
+  std::string access_token_;
+  base::Time expiration_time_;
+  scoped_ptr<GoogleServiceAuthError> error_;
+};
+
+DeviceOAuth2TokenService::ValidatingConsumer::ValidatingConsumer(
+    DeviceOAuth2TokenService* token_service,
+    Consumer* consumer)
+        : token_service_(token_service),
+          consumer_(consumer),
+          token_validation_done_(false),
+          token_is_valid_(false),
+          request_(NULL) {
+}
+
+DeviceOAuth2TokenService::ValidatingConsumer::~ValidatingConsumer() {
+}
+
+void DeviceOAuth2TokenService::ValidatingConsumer::StartValidation() {
+  DCHECK(!gaia_oauth_client_);
+  gaia_oauth_client_.reset(new gaia::GaiaOAuthClient(
+      g_browser_process->system_request_context()));
+
+  GaiaUrls* gaia_urls = GaiaUrls::GetInstance();
+  gaia::OAuthClientInfo client_info;
+  client_info.client_id = gaia_urls->oauth2_chrome_client_id();
+  client_info.client_secret = gaia_urls->oauth2_chrome_client_secret();
+
+  gaia_oauth_client_->RefreshToken(
+      client_info,
+      token_service_->GetRefreshToken(),
+      std::vector<std::string>(1, gaia_urls->oauth2_token_info_url()),
+      token_service_->max_refresh_token_validation_retries_,
+      this);
+}
+
+void DeviceOAuth2TokenService::ValidatingConsumer::OnRefreshTokenResponse(
+    const std::string& access_token,
+    int expires_in_seconds) {
+  gaia_oauth_client_->GetTokenInfo(
+      access_token,
+      token_service_->max_refresh_token_validation_retries_,
+      this);
+}
+
+void DeviceOAuth2TokenService::ValidatingConsumer::OnGetTokenInfoResponse(
+    scoped_ptr<DictionaryValue> token_info) {
+  std::string gaia_robot_id;
+  token_info->GetString("issued_to", &gaia_robot_id);
+
+  std::string policy_robot_id = token_service_->GetRobotAccountId();
+
+  if (policy_robot_id == gaia_robot_id) {
+    RefreshTokenIsValid(true);
+  } else {
+    if (gaia_robot_id.empty()) {
+      LOG(WARNING) << "Device service account owner in policy is empty.";
+    } else {
+      LOG(INFO) << "Device service account owner in policy does not match "
+                << "refresh token.";
+    }
+    RefreshTokenIsValid(false);
+  }
+}
+
+void DeviceOAuth2TokenService::ValidatingConsumer::OnOAuthError() {
+  RefreshTokenIsValid(false);
+}
+
+void DeviceOAuth2TokenService::ValidatingConsumer::OnNetworkError(
+    int response_code) {
+  RefreshTokenIsValid(false);
+}
+
+void DeviceOAuth2TokenService::ValidatingConsumer::OnGetTokenSuccess(
+      const Request* request,
+      const std::string& access_token,
+      const base::Time& expiration_time) {
+  request_ = request;
+  access_token_ = access_token;
+  expiration_time_ = expiration_time;
+  if (token_validation_done_)
+    InformConsumer();
+}
+
+void DeviceOAuth2TokenService::ValidatingConsumer::OnGetTokenFailure(
+      const Request* request,
+      const GoogleServiceAuthError& error) {
+  request_ = request;
+  error_.reset(new GoogleServiceAuthError(error.state()));
+  if (token_validation_done_)
+    InformConsumer();
+}
+
+void DeviceOAuth2TokenService::ValidatingConsumer::RefreshTokenIsValid(
+    bool is_valid) {
+  token_validation_done_ = true;
+  token_is_valid_ = is_valid;
+  // If we have a request pointer, then the minting is complete.
+  if (request_)
+    InformConsumer();
+}
+
+void DeviceOAuth2TokenService::ValidatingConsumer::InformConsumer() {
+  DCHECK(request_);
+  DCHECK(token_validation_done_);
+  if (!token_is_valid_) {
+    consumer_->OnGetTokenFailure(request_, GoogleServiceAuthError(
+        GoogleServiceAuthError::INVALID_GAIA_CREDENTIALS));
+  } else if (error_) {
+    consumer_->OnGetTokenFailure(request_, *error_.get());
+  } else {
+    consumer_->OnGetTokenSuccess(request_, access_token_, expiration_time_);
+  }
+  token_service_->OnValidationComplete(this, token_is_valid_);
+}
+
 DeviceOAuth2TokenService::DeviceOAuth2TokenService(
     net::URLRequestContextGetter* getter,
     PrefService* local_state)
     : OAuth2TokenService(getter),
+      refresh_token_is_valid_(false),
+      max_refresh_token_validation_retries_(3),
+      pending_validators_(new std::set<ValidatingConsumer*>()),
       local_state_(local_state) {
 }
 
 DeviceOAuth2TokenService::~DeviceOAuth2TokenService() {
+  STLDeleteElements(pending_validators_.get());
+}
+
+// TODO(davidroche): if the caller deletes the returned Request while
+// the fetches are in-flight, the OAuth2TokenService class won't call
+// back into the ValidatingConsumer and we'll end up with stale values
+// in pending_validators_ until this object is deleted.  Probably not a
+// big deal, but it should be resolved by returning a Request that this
+// object owns.

[Mattias Nissler (ping if slow), 2013/06/20 18:58:30]

The other problem now is that you start validations for each request (it'd be
sufficient to only start one.

[David Roche, 2013/06/20 20:13:59]

Only until the validation is successful, after which no more validations are
done.  Since getting parallel requests seemed unlikely, I liked the simplicity
of just having a single ValidatingConsumer instance per in-flight request.  But,
I can look at optimizing this away if you feel strongly about it.

+scoped_ptr<OAuth2TokenService::Request> DeviceOAuth2TokenService::StartRequest(
+    const OAuth2TokenService::ScopeSet& scopes,
+    OAuth2TokenService::Consumer* consumer) {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+
+  if (refresh_token_is_valid_) {
+    return OAuth2TokenService::StartRequest(scopes, consumer).Pass();
+  } else {
+    ValidatingConsumer* validating_consumer = new ValidatingConsumer(this,
+                                                                     consumer);
+    pending_validators_->insert(validating_consumer);
+
+    validating_consumer->StartValidation();
+    return OAuth2TokenService::StartRequest(scopes, validating_consumer).Pass();
+  }
+}
+
+void DeviceOAuth2TokenService::OnValidationComplete(
+    ValidatingConsumer* validator,
+    bool refresh_token_is_valid) {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+  refresh_token_is_valid_ = refresh_token_is_valid;
+  std::set<ValidatingConsumer*>::iterator iter = pending_validators_->find(
+      validator);
+  if (iter != pending_validators_->end())
+    pending_validators_->erase(iter);
+  else
+    LOG(ERROR) << "OnValidationComplete called for unknown validator";
 }
 
 // static
 void DeviceOAuth2TokenService::RegisterPrefs(PrefRegistrySimple* registry) {
   registry->RegisterStringPref(prefs::kDeviceRobotAnyApiRefreshToken,
                                std::string());
 }
 
 void DeviceOAuth2TokenService::SetAndSaveRefreshToken(
     const std::string& refresh_token) {
   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
   std::string encrypted_refresh_token =
       CryptohomeLibrary::Get()->EncryptWithSystemSalt(refresh_token);
 
   local_state_->SetString(prefs::kDeviceRobotAnyApiRefreshToken,
                           encrypted_refresh_token);
 }
 
 std::string DeviceOAuth2TokenService::GetRefreshToken() {
   if (refresh_token_.empty()) {
     std::string encrypted_refresh_token =
         local_state_->GetString(prefs::kDeviceRobotAnyApiRefreshToken);
 
     refresh_token_ = CryptohomeLibrary::Get()->DecryptWithSystemSalt(
         encrypted_refresh_token);
   }
   return refresh_token_;
 }
 
+std::string DeviceOAuth2TokenService::GetRobotAccountId() {
+  policy::BrowserPolicyConnector* connector =
+      g_browser_process->browser_policy_connector();
+  if (connector)
+    return connector->GetDeviceCloudPolicyManager()->GetRobotAccountId();
+  return std::string();
+}
+
 }  // namespace chromeos